I have a strange issue. My pump/motor is repeatedly breaking the impeller. I replaced two last year and just completed the replacement of another one this past Sunday. Three days later (today) I check the pool only to hear that familiar whine again. THREE DAYS!! The Pump is a 1.5 HP. I have 1.5 inch PVC from the motor to the sand filter. Please help - the people at the "pool store" don't have a clue. (But they are getting the part back tomorrow, they just don't know it yet LOL) Thanks!